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package deepmerge
import (
"errors"
)
var (
ErrKeyWithPrimitiveValueDefinedMoreThanOnce = errors.New("error due to parameter with value of primitive type: only maps and slices/arrays can be merged, which means you cannot have define the same key twice for parameters that are not maps or slices/arrays")
)
func DeepMerge(dst, src map[string]interface{}, config Config) error {
for srcKey, srcValue := range src {
if srcValueAsMap, ok := srcValue.(map[string]interface{}); ok { // handle maps
if dstValue, ok := dst[srcKey]; ok {
if dstValueAsMap, ok := dstValue.(map[string]interface{}); ok {
err := DeepMerge(dstValueAsMap, srcValueAsMap, config)
if err != nil {
return err
}
continue
}
} else {
dst[srcKey] = make(map[string]interface{})
}
err := DeepMerge(dst[srcKey].(map[string]interface{}), srcValueAsMap, config)
if err != nil {
return err
}
} else if srcValueAsSlice, ok := srcValue.([]interface{}); ok { // handle slices
if dstValue, ok := dst[srcKey]; ok {
if dstValueAsSlice, ok := dstValue.([]interface{}); ok {
// If both src and dst are slices, we'll copy the elements from that src slice over to the dst slice
dst[srcKey] = append(dstValueAsSlice, srcValueAsSlice...)
continue
}
}
dst[srcKey] = srcValueAsSlice
} else { // handle primitives
if config.PreventMultipleDefinitionsOfKeysWithPrimitiveValue {
if _, ok := dst[srcKey]; ok {
return ErrKeyWithPrimitiveValueDefinedMoreThanOnce
}
}
dst[srcKey] = srcValue
}
}
return nil
}
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